This is about crypto-mining operations that are running power plants that would otherwise not run. So to your point they are in fact banning the source of the pollution which is fossil fuel power plants. You're still free to pay market rates from the grid for your crypto-mining operations.
No, a letter summarizing a law says that, the law itself says:
>Section 2 places a moratorium on air permit issuance and renewal for an
electric generating facility that utilizes a carbon-based fuel and that
provides, in whole or in part, behind-the-meter electric energy consumed
or utilized by cryptocurrency mining operations that use proof-of-work
authentication methods to validate blockchain transactions.